Calibration Standards; Choosing Calibration Load Standards; Compensating For The Electrical Delay Of Calibration Standards - Agilent Technologies 8719D User Manual

The quality of the error-correction is limited by two factors: (1) the difference between the
model of the calibration standards and the actual electrical characteristics of those standards,
and (2) the condition of the calibration standards. 'Ib make the highest quality measurement
calibration, follow the suggestions below:
Inspect the calibration standards,
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Clean the calibration standards.
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Gauge the calibration standards.
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Use correct connection techniques.
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If you want to use calibration standards other than the default sets, you must change the
standard model (refer to "Modifying Calibration Kit Standards" located later in this chapter).
After you enter the mathematical model for the new calibration standards, the analyzer can
then use the model that corresponds to the new standards.
Measurement calibrations requiring load standards provide additional menus to specify the
load(s). For broadband calibrations, use either a broadband load or, for the highest level of
accuracy, a combination of lowband and sliding loads For measurements above 3 GHz in
3.5 mm, the lowband load calibration can be omitted. For measurements below 3 GHz in
3.5 mm, the lowband load alone is sufficient. If you try to use only a sliding load or only
a lowband load beyond these frequency cutoff points, the message CAUTION: ADDITIONAL
STANDARDS NEEDED will be displayed to indicate that both loads are required. See 'Ihble 5-3 for
the frequency cutoff points of different connector types.
Connector Type
3.5 mm
Type-N
2.4 mm

Compensating for the Electrical Delay of Calibration Standards

Short and open calibration standards in the 3.5~mm, 2.4~mm, and 2.92~mm connector types
have a certain amount of electrical delay. The analyzer compensates for this delay by offsetting
the calibration results by the total amount of electrical delay caused by the calibration standard
in both the forward and reverse direction. As a result, if these standards are measured after a
calibration, they will not appear to be "perfect" shorts or opens This is an indication that your
Optimizing Measurement Results
Load Standards
Broadband Load (50 MHz to 20 GEz)
50 MHz to 3 GHz
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50 MHz to 2 GHz
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50 MHz to 2 GHz
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50 MHz to 4 GHz
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Sliding Loa4l
3 GHz to 20 GHz
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2 GHz to 20 GHz
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2 GHz to 20 GHz
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4 GHz to 20 GHz
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